cover_tree.find('//' + XHTMLNS('img')).set('src', cover_name)
zip.writestr('OPS/cover.html', etree.tostring(
cover_tree, pretty_print = True, xml_declaration = True, encoding = "utf-8",
cover_tree.find('//' + XHTMLNS('img')).set('src', cover_name)
zip.writestr('OPS/cover.html', etree.tostring(
cover_tree, pretty_print = True, xml_declaration = True, encoding = "utf-8",